Fan Speed Control
SiBE611027_A
11
Function and Control
3. Fan Speed Control
Outline
Phase control and fan speed control contains 10 steps: LLL, LL, Q, S, L, ML, M, MH, H, and HH.
The airflow rate can be automatically controlled depending on the difference between the room
thermistor temperature and the target temperature. This is done through phase control and Hall
IC control.
For more information about Hall IC, refer to the troubleshooting for fan motor on page 46.
Automatic Fan
Speed Control
In automatic fan speed operation, the steps “Q” and “S” are not available.
= The airflow rate is automatically controlled within this range when the FAN setting
button is set to automatic.
Cooling
The following drawing explains the principle of fan speed control for cooling.
Heating
Step
Cooling/Heating
Fan
LLL
L tap fixed
LL
L
ML
M
MH
H
HH (POWERFUL)
(R6834)
+1.0˚C
+2.0˚C
–0.5˚C
+1.5˚C
+2.5˚C
0˚C
ML
M
L
LL
fan speed
(R12701)
Room thermistor temperature – target temperature
–
–
1.0
1.0
˚˚C
C
+0.5
+0.5
˚˚C
C
–
–
2.0
2.0
˚˚C
C
–
–
1.5
1.5
˚˚C
C
–
–
2.5
2.5
˚˚C
C
0
0
˚˚C
C
ML
M
L
LL
fan speed
(R12702)
Room thermistor temperature – target temperature
